Table 7: Economic analysis due to the application of NP fertilizer levels and plant spacing on marketable seed yield of Bombay Red onion grown at Shewa Robit.

N and P2O5 Rate (kg ha-1) Spacing (cm) Average Seed Yield (kg ha-1) Adjusted Seed Yield (kg ha-1) Gross Field Benefit (ETB ha-1) Total Cost (ETB ha-1) Net Benefit (ETB ha-1) Marginal Return Marginal Rate of Return (%) Benefit Cost Ratio
0 × 0 10 ×20×40 267 240.3 96120 60000 36120 0.602 60.2 0.602
85.5 × 86.25 10 ×20×40 459 413.1 165240 65578 99662 11.39 1139 1.52
114 × 115 10 ×20×40 662. 595.8 238320 67464.8 170855.2 18.04 1804 2.53
142.5 × 143.75 10 ×20×40 560. 504 201600 69330.2 132269.8 10.30 1030 1.907
142 × 69 10 ×20×40 611. 549.9 219960 67039.2 152920.8 16.59 1659 2.28
0 × 0 20×30×50 364. 327.6 131040 60000 71040 1.184 118.4 1.184
85.5 × 86.25 20×30×50 518. 466.2 186480 65578 120902 8.939 893.9 2.015
114 × 115 20×30×50 1103. 992.7 397080 67464.8 329615.2 34.639 3463.9 4.885
142.5 × 143.75 20×30×50 804. 723.6 289400 69330.2 220069.8 15.972 159.72 3.174
142 × 69 20×30×50 847. 762.3 304920 67039.2 237880.8 23.701 2370.1 3.548
0 × 0 10×40 435. 391.5 156600 60000 96600 1.61 161 1.61
85.5 × 86.25 10×40 479. 431.1 172440 65578 106862 1.839 183.9 1.629
114 × 115 10×40 837. 753.3 301320 67464.8 233855.2 18.386 1838.6 3.466
142.5 × 143.75 10×40 713 641.7 256680 69330.2 187349.8 9.726 972.6 2.70
142 × 69 10×40 906. 815.4 326160 67039.2 259120.8 23.08 2308 3.865
0 × 0 10×50 350 315 126000 60000 66000 1.1 110 1.1
85.5 × 86.25 10×50 504. 453.6 181400 65578 115822 8.931 893.1 1.766
114 × 115 10×50 614 552.6 221040 67464.8 153575.2 11.73 1173 2.276
142.5 × 143.75 10×50 627. 564.3 225720 69330.2 156389.8 9.68 968 2.255
142 × 69 10×50 967. 870.3 348120 67039.2 281080.8 30.55 3055 4.19
0 × 0 10×30 460. 414 165600 60000 105600 1.16 116 1.16
85.5 × 86.25 10×30 539. 485.1 194040 65578 128462 4.098 409.8 1.958
114 × 115 10×30 1181. 1062.9 425160 67039.2 358120.8 35.87 3587 5.34
142.5 × 143.75 10×30 627. 564.3 225600 69330.2 156269.8 5.43 543 2.253
142 × 69 10×30 938. 844.2 337680 67464.8 270215.2 22.0 2200 4.005

During experimental period the price of urea and DAP fertilizer was 14 and 16.16 ETB kg-1 and selling price of onion seed was 400 ETB kg-1.